The NUS Library’s use of the plugin is unusual in that they are not using it to display Google Earth imagery at all, but rather utilizing Google Earth’s sophisticated 3D engine to display the interiors of buildings. It doesn’t all work perfectly, but considering the changes in both browsers and the Google Earth API since 2008, that is to be expected. If you have the Google Earth plugin installed, and a browser that supports it, then head on over to their website and have a look around!
Amazingly, you can search for a book and it will show you which shelf it is on!
The Chinese Library. Most locations have popups for more information.